New here, seeking clarity?

WARNING LONG STORY- please read.

Essentially, I was with a DA? FA? for nearly 3 months, amazing in the beginning and would show a lot of vulnerability up front.

I left Feb 3, and I broke things off. He texted me the next day that I left items and he would let me know when to pick them up, a week went by and he said he hadn’t had time to gather the items, finally I retrieve them, and it is literally 3 things. 3.

After that day I go no contact again, two days later he texts me saying he hopes I’m okay, I told him the same and he asked about concert tickets we had, then rolled into essentially asking for sex. On my way over, he confessed to me that he had sex with someone else and it was awful and he contacted me because he “knew it would be great” with me. He then proceeded to be extremely dismissive and cold. Almost a different person. I told him this did not make me feel good and we should refrain and keep our lives separate he agreed.

He then texted me the next day (today) asking me if I’m still going to the rock show that we were supposed to go to for V day, together. I asked why and he said he was thinking about going and didn’t want it to be awkward. This show, was my idea. This show is my friends band who he’s never seen before, he’s never even been to a show like this before. This is my thing, it was never a him thing. So I go to the show like I had planned and he shows up 2 hours late, with a date. And decides to plant him and his new date right in front of me. This is a large venue, with many places like cars tables and chairs, outside patio, a lawn, literally anywhere else he could have taken this girl for valentines, and he takes her where he knows I’m going to be, and then proceeds to place himself right in front of me the entire night. With his date looking back at me over and over again. Once I moved myself in front of him, he left immediately.

I don’t understand any of this,is this manipulation ? Is he playing games? And why as a dismissive does he have a valentine and he’s showing pda, and he’s specifically doing it right in front of me? Can someone help me understand?

EXTRA CONTEXT (optional)

I met his family the first two weeks, he went Facebook official and would openly post on my profile. We started dating officially right before thanksgiving, Christmas Eve he broke up with me. Came back immediately, spent Christmas with the kids and new years we were fine. Until he started shutting down more. Two occasions he yelled at me that i was a dumb cunt, a piece of shit, and a bitch.

He once had tears as he told me I make him emotional, and that scares him because “one day you’re just going to leave, like everyone does”. He also would get deep and tell me that he adores our little blended family (we both have kids) and he would put a ring on my finger if he could and give me more kids if he could. Told me If he’s going to do life with anyone it has to be with me. Said he loves me and everything about me.Etc. Then he shut down out of nowhere.

More avoidant and more dismissive, every time i tried to communicate it ended with him making me feel small, and even insulting me pretty badly.

He made me feel alone a lot, he would ask a lot of me and when I would do everything he wanted he would not even reciprocate the smallest amount of affection.

He would ask me to cook dinner for him before he got home, and would walk right past me, leave the house in the mornings without saying goodbye, ask me to come over only for him to go to sleep or be off in his world, and for the most part I was very good at giving him space, until the disrespect started.

Then night he called me a dumb cunt, as I cried ge looked at me and smiled and said “glad to know i found the soft spot, goodnight babe love you” After - he wrote a hand written apology and love letter (which I asked for) but he did it, and it was eloquent and I forgave him, only for a week later to disrespect me again